Here's some sketches from our bike trip to Windsor. It was a long way (we spent 5 hours on bikes), but the path is very nice. It goes along the river most of the time, which is very picturesque, and features hundreds of geese, river locks, bridges and even a ferry. It was hard not to stop for sketching every fifteen minutes! Windsor castle:

A pencil sketch of a bridge in Staines, which is half way through: